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104 lines
5.0 KiB
HTML
104 lines
5.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Custom Debug Info (Debugging with GDB)</title>
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<meta name="description" content="Custom Debug Info (Debugging with GDB)">
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<meta name="keywords" content="Custom Debug Info (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="JIT-Interface.html#JIT-Interface" rel="up" title="JIT Interface">
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<link href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers" rel="next" title="Using JIT Debug Info Readers">
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<link href="Unregistering-Code.html#Unregistering-Code" rel="prev" title="Unregistering Code">
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<style type="text/css">
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Custom-Debug-Info"></a>
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<div class="header">
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<p>
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Previous: <a href="Unregistering-Code.html#Unregistering-Code" accesskey="p" rel="prev">Unregistering Code</a>, Up: <a href="JIT-Interface.html#JIT-Interface" accesskey="u" rel="up">JIT Interface</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Custom-Debug-Info-1"></a>
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<h3 class="section">29.4 Custom Debug Info</h3>
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<a name="index-custom-JIT-debug-info"></a>
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<a name="index-JIT-debug-info-reader"></a>
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<p>Generating debug information in platform-native file formats (like ELF
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or COFF) may be an overkill for JIT compilers; especially if all the
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debug info is used for is displaying a meaningful backtrace. The
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issue can be resolved by having the JIT writers decide on a debug info
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format and also provide a reader that parses the debug info generated
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by the JIT compiler. This section gives a brief overview on writing
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such a parser. More specific details can be found in the source file
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<samp>gdb/jit-reader.in</samp>, which is also installed as a header at
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<samp><var>includedir</var>/gdb/jit-reader.h</samp> for easy inclusion.
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</p>
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<p>The reader is implemented as a shared object (so this functionality is
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not available on platforms which don’t allow loading shared objects at
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runtime). Two <small>GDB</small> commands, <code>jit-reader-load</code> and
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<code>jit-reader-unload</code> are provided, to be used to load and unload
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the readers from a preconfigured directory. Once loaded, the shared
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object is used the parse the debug information emitted by the JIT
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compiler.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Using-JIT-Debug-Info-Readers.html#Using-JIT-Debug-Info-Readers" accesskey="1">Using JIT Debug Info Readers</a>:</td><td> </td><td align="left" valign="top">How to use supplied readers correctly
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Writing-JIT-Debug-Info-Readers.html#Writing-JIT-Debug-Info-Readers" accesskey="2">Writing JIT Debug Info Readers</a>:</td><td> </td><td align="left" valign="top">Creating a debug-info reader
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</td></tr>
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</table>
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</body>
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</html>
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